Add a build flag to configure bundling of HSTS preload list

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 4201f5b5d88d4ba4ca0826f3aa78255a9590f113..9aa45187d9ce7132227eae33cbacf221cebc0c20 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -54,6 +54,7 @@ buildflag_header("features") {
     "ENABLE_REPORTING=$enable_reporting",
     "ENABLE_WEBSOCKETS=$enable_websockets",
     "USE_BYTE_CERTS=$use_byte_certs",
+    "INCLUDE_TRANSPORT_SECURITY_STATE_PRELOAD_LIST=$include_transport_security_state_preload_list",
   ]
 }
 
@@ -286,6 +287,7 @@ component("net") {
     "http/http_vary_data.h",
     "http/transport_security_state.cc",
     "http/transport_security_state.h",
+    "http/transport_security_state_source.cc",
     "http/transport_security_state_source.h",
     "log/net_log.cc",
     "log/net_log.h",
@@ -360,11 +362,14 @@ component("net") {
     "//base",
     "//net/base/registry_controlled_domains",
     "//net/data/ssl/certificate_transparency:ct_log_list",
-    "//net/http:generate_transport_security_state",
     "//third_party/protobuf:protobuf_lite",
     "//url:url_features",
   ]
 
+  if (include_transport_security_state_preload_list) {
+    deps += [ "//net/http:generate_transport_security_state" ]
+  }
+
   public_deps = [
     ":net_quic_proto",
     ":traffic_annotation",